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crypto: keywrap - memzero the correct memory
[linux/fpc-iii.git] / net / ipv6 / datagram.c
blob428162155280ca2af782ea9fd9fa26e0d1666d89
1 /*
2 * common UDP/RAW code
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 */
13
14 #include <linux/capability.h>
15 #include <linux/errno.h>
16 #include <linux/types.h>
17 #include <linux/kernel.h>
18 #include <linux/interrupt.h>
19 #include <linux/socket.h>
20 #include <linux/sockios.h>
21 #include <linux/in6.h>
22 #include <linux/ipv6.h>
23 #include <linux/route.h>
24 #include <linux/slab.h>
25 #include <linux/export.h>
26
27 #include <net/ipv6.h>
28 #include <net/ndisc.h>
29 #include <net/addrconf.h>
30 #include <net/transp_v6.h>
31 #include <net/ip6_route.h>
32 #include <net/tcp_states.h>
33 #include <net/dsfield.h>
34
35 #include <linux/errqueue.h>
36 #include <asm/uaccess.h>
37
38 static bool ipv6_mapped_addr_any(const struct in6_addr *a)
39 {
40 return ipv6_addr_v4mapped(a) && (a->s6_addr32[3] == 0);
41 }
42
43 static int __ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
44 {
45 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
46 struct inet_sock *inet = inet_sk(sk);
47 struct ipv6_pinfo *np = inet6_sk(sk);
48 struct in6_addr *daddr, *final_p, final;
49 struct dst_entry *dst;
50 struct flowi6 fl6;
51 struct ip6_flowlabel *flowlabel = NULL;
52 struct ipv6_txoptions *opt;
53 int addr_type;
54 int err;
55
56 if (usin->sin6_family == AF_INET) {
57 if (__ipv6_only_sock(sk))
58 return -EAFNOSUPPORT;
59 err = __ip4_datagram_connect(sk, uaddr, addr_len);
60 goto ipv4_connected;
61 }
62
63 if (addr_len < SIN6_LEN_RFC2133)
64 return -EINVAL;
65
66 if (usin->sin6_family != AF_INET6)
67 return -EAFNOSUPPORT;
68
69 memset(&fl6, 0, sizeof(fl6));
70 if (np->sndflow) {
71 fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
72 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
73 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
74 if (!flowlabel)
75 return -EINVAL;
76 }
77 }
78
79 addr_type = ipv6_addr_type(&usin->sin6_addr);
80
81 if (addr_type == IPV6_ADDR_ANY) {
82 /*
83 * connect to self
84 */
85 usin->sin6_addr.s6_addr[15] = 0x01;
86 }
87
88 daddr = &usin->sin6_addr;
89
90 if (addr_type == IPV6_ADDR_MAPPED) {
91 struct sockaddr_in sin;
92
93 if (__ipv6_only_sock(sk)) {
94 err = -ENETUNREACH;
95 goto out;
96 }
97 sin.sin_family = AF_INET;
98 sin.sin_addr.s_addr = daddr->s6_addr32[3];
99 sin.sin_port = usin->sin6_port;
100
101 err = __ip4_datagram_connect(sk,
102 (struct sockaddr *) &sin,
103 sizeof(sin));
104
105 ipv4_connected:
106 if (err)
107 goto out;
108
109 ipv6_addr_set_v4mapped(inet->inet_daddr, &sk->sk_v6_daddr);
110
111 if (ipv6_addr_any(&np->saddr) ||
112 ipv6_mapped_addr_any(&np->saddr))
113 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
114
115 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) ||
116 ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) {
117 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr,
118 &sk->sk_v6_rcv_saddr);
119 if (sk->sk_prot->rehash)
120 sk->sk_prot->rehash(sk);
121 }
122
123 goto out;
124 }
125
126 if (__ipv6_addr_needs_scope_id(addr_type)) {
127 if (addr_len >= sizeof(struct sockaddr_in6) &&
128 usin->sin6_scope_id) {
129 if (sk->sk_bound_dev_if &&
130 sk->sk_bound_dev_if != usin->sin6_scope_id) {
131 err = -EINVAL;
132 goto out;
133 }
134 sk->sk_bound_dev_if = usin->sin6_scope_id;
135 }
136
137 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST))
138 sk->sk_bound_dev_if = np->mcast_oif;
139
140 /* Connect to link-local address requires an interface */
141 if (!sk->sk_bound_dev_if) {
142 err = -EINVAL;
143 goto out;
144 }
145 }
146
147 sk->sk_v6_daddr = *daddr;
148 np->flow_label = fl6.flowlabel;
149
150 inet->inet_dport = usin->sin6_port;
151
152 /*
153 * Check for a route to destination an obtain the
154 * destination cache for it.
155 */
156
157 fl6.flowi6_proto = sk->sk_protocol;
158 fl6.daddr = sk->sk_v6_daddr;
159 fl6.saddr = np->saddr;
160 fl6.flowi6_oif = sk->sk_bound_dev_if;
161 fl6.flowi6_mark = sk->sk_mark;
162 fl6.fl6_dport = inet->inet_dport;
163 fl6.fl6_sport = inet->inet_sport;
164
165 if (!fl6.flowi6_oif)
166 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
167
168 if (!fl6.flowi6_oif && (addr_type&IPV6_ADDR_MULTICAST))
169 fl6.flowi6_oif = np->mcast_oif;
170
171 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
172
173 rcu_read_lock();
174 opt = flowlabel ? flowlabel->opt : rcu_dereference(np->opt);
175 final_p = fl6_update_dst(&fl6, opt, &final);
176 rcu_read_unlock();
177
178 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
179 err = 0;
180 if (IS_ERR(dst)) {
181 err = PTR_ERR(dst);
182 goto out;
183 }
184
185 /* source address lookup done in ip6_dst_lookup */
186
187 if (ipv6_addr_any(&np->saddr))
188 np->saddr = fl6.saddr;
189
190 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
191 sk->sk_v6_rcv_saddr = fl6.saddr;
192 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
193 if (sk->sk_prot->rehash)
194 sk->sk_prot->rehash(sk);
195 }
196
197 ip6_dst_store(sk, dst,
198 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ?
199 &sk->sk_v6_daddr : NULL,
200 #ifdef CONFIG_IPV6_SUBTREES
201 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
202 &np->saddr :
203 #endif
204 NULL);
205
206 sk->sk_state = TCP_ESTABLISHED;
207 sk_set_txhash(sk);
208 out:
209 fl6_sock_release(flowlabel);
210 return err;
211 }
212
213 int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
214 {
215 int res;
216
217 lock_sock(sk);
218 res = __ip6_datagram_connect(sk, uaddr, addr_len);
219 release_sock(sk);
220 return res;
221 }
222 EXPORT_SYMBOL_GPL(ip6_datagram_connect);
223
224 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr,
225 int addr_len)
226 {
227 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr);
228 if (sin6->sin6_family != AF_INET6)
229 return -EAFNOSUPPORT;
230 return ip6_datagram_connect(sk, uaddr, addr_len);
231 }
232 EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only);
233
234 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
235 __be16 port, u32 info, u8 *payload)
236 {
237 struct ipv6_pinfo *np = inet6_sk(sk);
238 struct icmp6hdr *icmph = icmp6_hdr(skb);
239 struct sock_exterr_skb *serr;
240
241 if (!np->recverr)
242 return;
243
244 skb = skb_clone(skb, GFP_ATOMIC);
245 if (!skb)
246 return;
247
248 skb->protocol = htons(ETH_P_IPV6);
249
250 serr = SKB_EXT_ERR(skb);
251 serr->ee.ee_errno = err;
252 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
253 serr->ee.ee_type = icmph->icmp6_type;
254 serr->ee.ee_code = icmph->icmp6_code;
255 serr->ee.ee_pad = 0;
256 serr->ee.ee_info = info;
257 serr->ee.ee_data = 0;
258 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
259 skb_network_header(skb);
260 serr->port = port;
261
262 __skb_pull(skb, payload - skb->data);
263 skb_reset_transport_header(skb);
264
265 if (sock_queue_err_skb(sk, skb))
266 kfree_skb(skb);
267 }
268
269 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info)
270 {
271 const struct ipv6_pinfo *np = inet6_sk(sk);
272 struct sock_exterr_skb *serr;
273 struct ipv6hdr *iph;
274 struct sk_buff *skb;
275
276 if (!np->recverr)
277 return;
278
279 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
280 if (!skb)
281 return;
282
283 skb->protocol = htons(ETH_P_IPV6);
284
285 skb_put(skb, sizeof(struct ipv6hdr));
286 skb_reset_network_header(skb);
287 iph = ipv6_hdr(skb);
288 iph->daddr = fl6->daddr;
289
290 serr = SKB_EXT_ERR(skb);
291 serr->ee.ee_errno = err;
292 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
293 serr->ee.ee_type = 0;
294 serr->ee.ee_code = 0;
295 serr->ee.ee_pad = 0;
296 serr->ee.ee_info = info;
297 serr->ee.ee_data = 0;
298 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
299 serr->port = fl6->fl6_dport;
300
301 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
302 skb_reset_transport_header(skb);
303
304 if (sock_queue_err_skb(sk, skb))
305 kfree_skb(skb);
306 }
307
308 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu)
309 {
310 struct ipv6_pinfo *np = inet6_sk(sk);
311 struct ipv6hdr *iph;
312 struct sk_buff *skb;
313 struct ip6_mtuinfo *mtu_info;
314
315 if (!np->rxopt.bits.rxpmtu)
316 return;
317
318 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
319 if (!skb)
320 return;
321
322 skb_put(skb, sizeof(struct ipv6hdr));
323 skb_reset_network_header(skb);
324 iph = ipv6_hdr(skb);
325 iph->daddr = fl6->daddr;
326
327 mtu_info = IP6CBMTU(skb);
328
329 mtu_info->ip6m_mtu = mtu;
330 mtu_info->ip6m_addr.sin6_family = AF_INET6;
331 mtu_info->ip6m_addr.sin6_port = 0;
332 mtu_info->ip6m_addr.sin6_flowinfo = 0;
333 mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif;
334 mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr;
335
336 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
337 skb_reset_transport_header(skb);
338
339 skb = xchg(&np->rxpmtu, skb);
340 kfree_skb(skb);
341 }
342
343 /* For some errors we have valid addr_offset even with zero payload and
344 * zero port. Also, addr_offset should be supported if port is set.
345 */
346 static inline bool ipv6_datagram_support_addr(struct sock_exterr_skb *serr)
347 {
348 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6 ||
349 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
350 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port;
351 }
352
353 /* IPv6 supports cmsg on all origins aside from SO_EE_ORIGIN_LOCAL.
354 *
355 * At one point, excluding local errors was a quick test to identify icmp/icmp6
356 * errors. This is no longer true, but the test remained, so the v6 stack,
357 * unlike v4, also honors cmsg requests on all wifi and timestamp errors.
358 *
359 * Timestamp code paths do not initialize the fields expected by cmsg:
360 * the PKTINFO fields in skb->cb[]. Fill those in here.
361 */
362 static bool ip6_datagram_support_cmsg(struct sk_buff *skb,
363 struct sock_exterr_skb *serr)
364 {
365 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
366 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6)
367 return true;
368
369 if (serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL)
370 return false;
371
372 if (!skb->dev)
373 return false;
374
375 if (skb->protocol == htons(ETH_P_IPV6))
376 IP6CB(skb)->iif = skb->dev->ifindex;
377 else
378 PKTINFO_SKB_CB(skb)->ipi_ifindex = skb->dev->ifindex;
379
380 return true;
381 }
382
383 /*
384 * Handle MSG_ERRQUEUE
385 */
386 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
387 {
388 struct ipv6_pinfo *np = inet6_sk(sk);
389 struct sock_exterr_skb *serr;
390 struct sk_buff *skb;
391 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
392 struct {
393 struct sock_extended_err ee;
394 struct sockaddr_in6 offender;
395 } errhdr;
396 int err;
397 int copied;
398
399 err = -EAGAIN;
400 skb = sock_dequeue_err_skb(sk);
401 if (!skb)
402 goto out;
403
404 copied = skb->len;
405 if (copied > len) {
406 msg->msg_flags |= MSG_TRUNC;
407 copied = len;
408 }
409 err = skb_copy_datagram_msg(skb, 0, msg, copied);
410 if (err)
411 goto out_free_skb;
412
413 sock_recv_timestamp(msg, sk, skb);
414
415 serr = SKB_EXT_ERR(skb);
416
417 if (sin && ipv6_datagram_support_addr(serr)) {
418 const unsigned char *nh = skb_network_header(skb);
419 sin->sin6_family = AF_INET6;
420 sin->sin6_flowinfo = 0;
421 sin->sin6_port = serr->port;
422 if (skb->protocol == htons(ETH_P_IPV6)) {
423 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset),
424 struct ipv6hdr, daddr);
425 sin->sin6_addr = ip6h->daddr;
426 if (np->sndflow)
427 sin->sin6_flowinfo = ip6_flowinfo(ip6h);
428 sin->sin6_scope_id =
429 ipv6_iface_scope_id(&sin->sin6_addr,
430 IP6CB(skb)->iif);
431 } else {
432 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
433 &sin->sin6_addr);
434 sin->sin6_scope_id = 0;
435 }
436 *addr_len = sizeof(*sin);
437 }
438
439 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
440 sin = &errhdr.offender;
441 memset(sin, 0, sizeof(*sin));
442
443 if (ip6_datagram_support_cmsg(skb, serr)) {
444 sin->sin6_family = AF_INET6;
445 if (np->rxopt.all)
446 ip6_datagram_recv_common_ctl(sk, msg, skb);
447 if (skb->protocol == htons(ETH_P_IPV6)) {
448 sin->sin6_addr = ipv6_hdr(skb)->saddr;
449 if (np->rxopt.all)
450 ip6_datagram_recv_specific_ctl(sk, msg, skb);
451 sin->sin6_scope_id =
452 ipv6_iface_scope_id(&sin->sin6_addr,
453 IP6CB(skb)->iif);
454 } else {
455 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
456 &sin->sin6_addr);
457 if (inet_sk(sk)->cmsg_flags)
458 ip_cmsg_recv(msg, skb);
459 }
460 }
461
462 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
463
464 /* Now we could try to dump offended packet options */
465
466 msg->msg_flags |= MSG_ERRQUEUE;
467 err = copied;
468
469 out_free_skb:
470 kfree_skb(skb);
471 out:
472 return err;
473 }
474 EXPORT_SYMBOL_GPL(ipv6_recv_error);
475
476 /*
477 * Handle IPV6_RECVPATHMTU
478 */
479 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
480 int *addr_len)
481 {
482 struct ipv6_pinfo *np = inet6_sk(sk);
483 struct sk_buff *skb;
484 struct ip6_mtuinfo mtu_info;
485 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
486 int err;
487 int copied;
488
489 err = -EAGAIN;
490 skb = xchg(&np->rxpmtu, NULL);
491 if (!skb)
492 goto out;
493
494 copied = skb->len;
495 if (copied > len) {
496 msg->msg_flags |= MSG_TRUNC;
497 copied = len;
498 }
499 err = skb_copy_datagram_msg(skb, 0, msg, copied);
500 if (err)
501 goto out_free_skb;
502
503 sock_recv_timestamp(msg, sk, skb);
504
505 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info));
506
507 if (sin) {
508 sin->sin6_family = AF_INET6;
509 sin->sin6_flowinfo = 0;
510 sin->sin6_port = 0;
511 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
512 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr;
513 *addr_len = sizeof(*sin);
514 }
515
516 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);
517
518 err = copied;
519
520 out_free_skb:
521 kfree_skb(skb);
522 out:
523 return err;
524 }
525
526
527 void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg,
528 struct sk_buff *skb)
529 {
530 struct ipv6_pinfo *np = inet6_sk(sk);
531 bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6);
532
533 if (np->rxopt.bits.rxinfo) {
534 struct in6_pktinfo src_info;
535
536 if (is_ipv6) {
537 src_info.ipi6_ifindex = IP6CB(skb)->iif;
538 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
539 } else {
540 src_info.ipi6_ifindex =
541 PKTINFO_SKB_CB(skb)->ipi_ifindex;
542 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
543 &src_info.ipi6_addr);
544 }
545
546 if (src_info.ipi6_ifindex >= 0)
547 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO,
548 sizeof(src_info), &src_info);
549 }
550 }
551
552 void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg,
553 struct sk_buff *skb)
554 {
555 struct ipv6_pinfo *np = inet6_sk(sk);
556 struct inet6_skb_parm *opt = IP6CB(skb);
557 unsigned char *nh = skb_network_header(skb);
558
559 if (np->rxopt.bits.rxhlim) {
560 int hlim = ipv6_hdr(skb)->hop_limit;
561 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
562 }
563
564 if (np->rxopt.bits.rxtclass) {
565 int tclass = ipv6_get_dsfield(ipv6_hdr(skb));
566 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
567 }
568
569 if (np->rxopt.bits.rxflow) {
570 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh);
571 if (flowinfo)
572 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
573 }
574
575 /* HbH is allowed only once */
576 if (np->rxopt.bits.hopopts && (opt->flags & IP6SKB_HOPBYHOP)) {
577 u8 *ptr = nh + sizeof(struct ipv6hdr);
578 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
579 }
580
581 if (opt->lastopt &&
582 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
583 /*
584 * Silly enough, but we need to reparse in order to
585 * report extension headers (except for HbH)
586 * in order.
587 *
588 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
589 * (and WILL NOT be) defined because
590 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
591 */
592 unsigned int off = sizeof(struct ipv6hdr);
593 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
594
595 while (off <= opt->lastopt) {
596 unsigned int len;
597 u8 *ptr = nh + off;
598
599 switch (nexthdr) {
600 case IPPROTO_DSTOPTS:
601 nexthdr = ptr[0];
602 len = (ptr[1] + 1) << 3;
603 if (np->rxopt.bits.dstopts)
604 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
605 break;
606 case IPPROTO_ROUTING:
607 nexthdr = ptr[0];
608 len = (ptr[1] + 1) << 3;
609 if (np->rxopt.bits.srcrt)
610 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
611 break;
612 case IPPROTO_AH:
613 nexthdr = ptr[0];
614 len = (ptr[1] + 2) << 2;
615 break;
616 default:
617 nexthdr = ptr[0];
618 len = (ptr[1] + 1) << 3;
619 break;
620 }
621
622 off += len;
623 }
624 }
625
626 /* socket options in old style */
627 if (np->rxopt.bits.rxoinfo) {
628 struct in6_pktinfo src_info;
629
630 src_info.ipi6_ifindex = opt->iif;
631 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
632 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
633 }
634 if (np->rxopt.bits.rxohlim) {
635 int hlim = ipv6_hdr(skb)->hop_limit;
636 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
637 }
638 if (np->rxopt.bits.ohopopts && (opt->flags & IP6SKB_HOPBYHOP)) {
639 u8 *ptr = nh + sizeof(struct ipv6hdr);
640 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
641 }
642 if (np->rxopt.bits.odstopts && opt->dst0) {
643 u8 *ptr = nh + opt->dst0;
644 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
645 }
646 if (np->rxopt.bits.osrcrt && opt->srcrt) {
647 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
648 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
649 }
650 if (np->rxopt.bits.odstopts && opt->dst1) {
651 u8 *ptr = nh + opt->dst1;
652 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
653 }
654 if (np->rxopt.bits.rxorigdstaddr) {
655 struct sockaddr_in6 sin6;
656 __be16 *ports = (__be16 *) skb_transport_header(skb);
657
658 if (skb_transport_offset(skb) + 4 <= skb->len) {
659 /* All current transport protocols have the port numbers in the
660 * first four bytes of the transport header and this function is
661 * written with this assumption in mind.
662 */
663
664 sin6.sin6_family = AF_INET6;
665 sin6.sin6_addr = ipv6_hdr(skb)->daddr;
666 sin6.sin6_port = ports[1];
667 sin6.sin6_flowinfo = 0;
668 sin6.sin6_scope_id =
669 ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr,
670 opt->iif);
671
672 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6);
673 }
674 }
675 }
676
677 void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
678 struct sk_buff *skb)
679 {
680 ip6_datagram_recv_common_ctl(sk, msg, skb);
681 ip6_datagram_recv_specific_ctl(sk, msg, skb);
682 }
683 EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl);
684
685 int ip6_datagram_send_ctl(struct net *net, struct sock *sk,
686 struct msghdr *msg, struct flowi6 *fl6,
687 struct ipv6_txoptions *opt,
688 int *hlimit, int *tclass, int *dontfrag)
689 {
690 struct in6_pktinfo *src_info;
691 struct cmsghdr *cmsg;
692 struct ipv6_rt_hdr *rthdr;
693 struct ipv6_opt_hdr *hdr;
694 int len;
695 int err = 0;
696
697 for_each_cmsghdr(cmsg, msg) {
698 int addr_type;
699
700 if (!CMSG_OK(msg, cmsg)) {
701 err = -EINVAL;
702 goto exit_f;
703 }
704
705 if (cmsg->cmsg_level != SOL_IPV6)
706 continue;
707
708 switch (cmsg->cmsg_type) {
709 case IPV6_PKTINFO:
710 case IPV6_2292PKTINFO:
711 {
712 struct net_device *dev = NULL;
713
714 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
715 err = -EINVAL;
716 goto exit_f;
717 }
718
719 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
720
721 if (src_info->ipi6_ifindex) {
722 if (fl6->flowi6_oif &&
723 src_info->ipi6_ifindex != fl6->flowi6_oif)
724 return -EINVAL;
725 fl6->flowi6_oif = src_info->ipi6_ifindex;
726 }
727
728 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
729
730 rcu_read_lock();
731 if (fl6->flowi6_oif) {
732 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
733 if (!dev) {
734 rcu_read_unlock();
735 return -ENODEV;
736 }
737 } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
738 rcu_read_unlock();
739 return -EINVAL;
740 }
741
742 if (addr_type != IPV6_ADDR_ANY) {
743 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
744 if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) &&
745 !ipv6_chk_addr(net, &src_info->ipi6_addr,
746 strict ? dev : NULL, 0) &&
747 !ipv6_chk_acast_addr_src(net, dev,
748 &src_info->ipi6_addr))
749 err = -EINVAL;
750 else
751 fl6->saddr = src_info->ipi6_addr;
752 }
753
754 rcu_read_unlock();
755
756 if (err)
757 goto exit_f;
758
759 break;
760 }
761
762 case IPV6_FLOWINFO:
763 if (cmsg->cmsg_len < CMSG_LEN(4)) {
764 err = -EINVAL;
765 goto exit_f;
766 }
767
768 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) {
769 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
770 err = -EINVAL;
771 goto exit_f;
772 }
773 }
774 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
775 break;
776
777 case IPV6_2292HOPOPTS:
778 case IPV6_HOPOPTS:
779 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
780 err = -EINVAL;
781 goto exit_f;
782 }
783
784 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
785 len = ((hdr->hdrlen + 1) << 3);
786 if (cmsg->cmsg_len < CMSG_LEN(len)) {
787 err = -EINVAL;
788 goto exit_f;
789 }
790 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
791 err = -EPERM;
792 goto exit_f;
793 }
794 opt->opt_nflen += len;
795 opt->hopopt = hdr;
796 break;
797
798 case IPV6_2292DSTOPTS:
799 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
800 err = -EINVAL;
801 goto exit_f;
802 }
803
804 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
805 len = ((hdr->hdrlen + 1) << 3);
806 if (cmsg->cmsg_len < CMSG_LEN(len)) {
807 err = -EINVAL;
808 goto exit_f;
809 }
810 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
811 err = -EPERM;
812 goto exit_f;
813 }
814 if (opt->dst1opt) {
815 err = -EINVAL;
816 goto exit_f;
817 }
818 opt->opt_flen += len;
819 opt->dst1opt = hdr;
820 break;
821
822 case IPV6_DSTOPTS:
823 case IPV6_RTHDRDSTOPTS:
824 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
825 err = -EINVAL;
826 goto exit_f;
827 }
828
829 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
830 len = ((hdr->hdrlen + 1) << 3);
831 if (cmsg->cmsg_len < CMSG_LEN(len)) {
832 err = -EINVAL;
833 goto exit_f;
834 }
835 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
836 err = -EPERM;
837 goto exit_f;
838 }
839 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
840 opt->opt_flen += len;
841 opt->dst1opt = hdr;
842 } else {
843 opt->opt_nflen += len;
844 opt->dst0opt = hdr;
845 }
846 break;
847
848 case IPV6_2292RTHDR:
849 case IPV6_RTHDR:
850 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
851 err = -EINVAL;
852 goto exit_f;
853 }
854
855 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
856
857 switch (rthdr->type) {
858 #if IS_ENABLED(CONFIG_IPV6_MIP6)
859 case IPV6_SRCRT_TYPE_2:
860 if (rthdr->hdrlen != 2 ||
861 rthdr->segments_left != 1) {
862 err = -EINVAL;
863 goto exit_f;
864 }
865 break;
866 #endif
867 default:
868 err = -EINVAL;
869 goto exit_f;
870 }
871
872 len = ((rthdr->hdrlen + 1) << 3);
873
874 if (cmsg->cmsg_len < CMSG_LEN(len)) {
875 err = -EINVAL;
876 goto exit_f;
877 }
878
879 /* segments left must also match */
880 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
881 err = -EINVAL;
882 goto exit_f;
883 }
884
885 opt->opt_nflen += len;
886 opt->srcrt = rthdr;
887
888 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
889 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
890
891 opt->opt_nflen += dsthdrlen;
892 opt->dst0opt = opt->dst1opt;
893 opt->dst1opt = NULL;
894 opt->opt_flen -= dsthdrlen;
895 }
896
897 break;
898
899 case IPV6_2292HOPLIMIT:
900 case IPV6_HOPLIMIT:
901 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
902 err = -EINVAL;
903 goto exit_f;
904 }
905
906 *hlimit = *(int *)CMSG_DATA(cmsg);
907 if (*hlimit < -1 || *hlimit > 0xff) {
908 err = -EINVAL;
909 goto exit_f;
910 }
911
912 break;
913
914 case IPV6_TCLASS:
915 {
916 int tc;
917
918 err = -EINVAL;
919 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
920 goto exit_f;
921
922 tc = *(int *)CMSG_DATA(cmsg);
923 if (tc < -1 || tc > 0xff)
924 goto exit_f;
925
926 err = 0;
927 *tclass = tc;
928
929 break;
930 }
931
932 case IPV6_DONTFRAG:
933 {
934 int df;
935
936 err = -EINVAL;
937 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
938 goto exit_f;
939
940 df = *(int *)CMSG_DATA(cmsg);
941 if (df < 0 || df > 1)
942 goto exit_f;
943
944 err = 0;
945 *dontfrag = df;
946
947 break;
948 }
949 default:
950 net_dbg_ratelimited("invalid cmsg type: %d\n",
951 cmsg->cmsg_type);
952 err = -EINVAL;
953 goto exit_f;
954 }
955 }
956
957 exit_f:
958 return err;
959 }
960 EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl);
961
962 void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp,
963 __u16 srcp, __u16 destp, int bucket)
964 {
965 const struct in6_addr *dest, *src;
966
967 dest = &sp->sk_v6_daddr;
968 src = &sp->sk_v6_rcv_saddr;
969 seq_printf(seq,
970 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
971 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n",
972 bucket,
973 src->s6_addr32[0], src->s6_addr32[1],
974 src->s6_addr32[2], src->s6_addr32[3], srcp,
975 dest->s6_addr32[0], dest->s6_addr32[1],
976 dest->s6_addr32[2], dest->s6_addr32[3], destp,
977 sp->sk_state,
978 sk_wmem_alloc_get(sp),
979 sk_rmem_alloc_get(sp),
980 0, 0L, 0,
981 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
982 0,
983 sock_i_ino(sp),
984 atomic_read(&sp->sk_refcnt), sp,
985 atomic_read(&sp->sk_drops));
986 }
Linux with added FPC-III support